I've already posted this as a response to another person's question but I'll post it here and then post a new thread:
SLS is releasing a new fan-cooled version of the Tek light with an included acrylic shield and reportedly improved reflectors. I'd wait to buy a Tek light until the new year. You then have the option of getting the un-cooled Tek at a presumably lower price or getting a better fixture with active cooling. The cooling at this point looks like it may be a little rinky-dink based on casual observation of the single fan, but who knows how well it works until it's released.
Read this link for more information:
http://reefcentral.com/forums/showthread.php?t=1738100